Green synthesis of silicon dioxide nanoparticles using aqueous bulb extracts of Allium sativum: characterization, antioxidant activity and seed germination study
摘要
The present investigation demonstrated the exploitation of a natural renewable agent for the synthesis of silicon dioxide nanoparticles. The novelty of the present study is that utilization of Allium sativum’s bulbs for the synthesis of silicon dioxide nanoparticles to improve the growth of Pennisetum glaucum. The synthesized Allium sativum-mediated silicon dioxide nanoparticles were characterized using various analytical techniques. XRD pattern illustrated that the synthesized nanoparticles were amorphous. FTIR characterization proves the occurrence of functional groups such as Si-O-Si, Si-OR, and S = O in the silicon dioxide nanoparticles. The FESEM and TEM analysis shows that the particles were irregular in shape with an average size of 12 nm and the EDX spectrum confirms the existence of Si and O. In addition, the impact of A. sativum-mediated silicon dioxide nanoparticles on germination, shoot, and root formation of Pennisetum glaucum was investigated. The seed germination analysis shows that the lowest concentrations (200 µg/mL) of A. sativum-mediated silicon dioxide nanoparticles showed the best results in the growth of shoot (136 mm) and root (88 mm) as compared to the control (untreated seeds). In addition, synthesized silicon dioxide nanoparticles have significant antioxidant activity (IC50 = 148.07 µg) and have been proved by DPPH assay. The A. sativum-mediated synthesis of silicon dioxide nanoparticles could have budding applications in the agriculture and medical industries.